I actually have grown to dislike Litmus to be honest. I've sent an email to Litmus and to a device it was emulating, and it looked great on the device and busted as hell on Litmus. Leads to some false negative bugfixes.
I'm actually the Community Manager at Litmus. If you still use the service and have issues, don't hesitate to shoot us an email at hello@litmus.com - we're always trying to improve the service and help out our customers.